Use Unicode Line Break algorithm rendering Markdown for scriptio continua languages

[mondeja]

Closes #153

[codecov]

Codecov Report

Base: 97.82% // Head: 97.84% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (70b41b5) compared to base (9d006c5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
+ Coverage   97.82%   97.84%   +0.02%     
==========================================
  Files          19       19              
  Lines        2111     2137      +26     
==========================================
+ Hits         2065     2091      +26     
  Misses         46       46              

Impacted Files	Coverage Δ
src/mdpo/po2md/__init__.py	98.29% <100.00%> (+<0.01%)	⬆️
src/mdpo/text.py	100.00% <100.00%> (ø)

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